When the plants grow in a natural environment permanently. In the County that does not have to loosen. The quantity of organic carbon in the soil is related to the quantity of plant debris fallen down rotten rate of soil and plants generally.
When plants grow permanently in the environment. In the no-tillage. The amount of organic carbon in the soil to be correlated with the amount of plant debris that fall to the ground, and the rate of rotting vegetation.
When the plants grow stably in natural environment where there is no tillage practices. Total organic carbon in soil is related to the amount of plant debris falling down the soil and rot rot rate of grain